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  1. #1
    Silver Member
    Join Date
    Mar 2007
    Posts
    150
    Location
    Hempstead, TX
    Tractor
    Case DX55

    Default Engine carbon cleaning

    I have a 12hp B&S engine that runs really well. I bought it used, and when i pulled the plug, there is caked on carbon, it hasnt been changed since new in 1992. Anyway, i put a new plug in and pulled it after a few hours of use and noiticed a film of oil on it, why i don't know. The engine was owned by a guy i know who is particular about maintenance. I also have another B&S engine that is essentially brand new and it has the same thing so i dont think its a problem. At any rate, there IS caked on carbon on the valves and on the cylinder that i can see through the spark plug hole. Do you recomend pulling the head and scrubbing that off? I don't think its something that is going to be removed otherwise. I have pulled hte head on other engines to do this so its not a big deal.

  2. #2
    Elite Member
    Join Date
    Mar 2005
    Posts
    2,620
    Location
    Bedford, VA
    Tractor
    John Deere 2320

    Default Re: Engine carbon cleaning

    I understand that 'seafoam' does miracles on some items like this.. BUT like all things some say it doesnt work at all and others swear by it..

    good luck

    Brian
    Bedford, VA
    2320 w/ 62D MMM, 200CX FEL, Pats EZ Change, LX4 Cutter
    Co-owner (with my father) of John Deere 790, 30 HP, 4x4, 513 cutter, 70 FEL
    2012 Nissan Xterra Pro-4x

  3. #3
    Epic Contributor Bird's Avatar
    Join Date
    Mar 2000
    Posts
    38,213
    Location
    Texas

    Default Re: Engine carbon cleaning

    I had a boat motor recently that wouldn't idle and used Mercury Power Tune, by following the instructions on the can and that very promptly fixed the problem. I wonder whether it wouldn't work on Briggs & Stratton engines, too. I'm sure you can buy it at most any boat dealer that sells Mercury motors.
    Bird

  4. #4
    Super Member
    Join Date
    Apr 2000
    Posts
    6,294
    Location
    central New York
    Tractor
    all makes and models

    Default Re: Engine carbon cleaning

    Years ago while working in a car dealership one of the shops lead mechanics told me that to make it easy for clean-up while rebuilding to get the engine warmed up and to hold it up about half throttle or at least enough for it not to stall and to take a spray bottle of water and spray it in the carb, I think it works great! Every engine I rebuild that I know needs it and not looking for an individual flaw it will take the carbon off and leave the parts nice and steam cleaner clean!

  5. #5
    Elite Member coobie's Avatar
    Join Date
    Sep 2004
    Posts
    2,960
    Location
    S.Michigan
    Tractor
    Kubota RTV 900, JD 740,Kioti DK 40 with KL401 loader .

    Default Re: Engine carbon cleaning

    Seafoam or BG-44K products.Both are good products.coobie

  6. #6
    Platinum Member
    Join Date
    Aug 2005
    Posts
    580
    Location
    Sedro Woolley, WA
    Tractor
    Kubota L3400 (gear driven)

    Default Re: Engine carbon cleaning

    I've had good success with Seafoam. I keep a couple of bottles around.

  7. #7
    Platinum Member Molerj's Avatar
    Join Date
    Jul 2001
    Posts
    575
    Location
    Eastern Ohio
    Tractor
    JD 955, Economy Power King

    Default Re: Engine carbon cleaning

    I would pull the head, take a wire wheel on a drill or 4 1/2" angle grinder & clean it off. Leave piston at end of travel, then back off a little to get the ridge that will be on the end of the cylinder. Should replace the head gasket & torque the bolts in the proper tightening sequence.
    Ron

  8. #8
    Member
    Join Date
    May 2006
    Posts
    49
    Location
    SW Ohio
    Tractor
    Lenar FS-274

    Default Re: Engine carbon cleaning

    I have had luck using Seafoam and/or Deep Creep (aeresol version) in both outboards and mowers (2 and 4 stroke).

  9. #9
    Silver Member
    Join Date
    Mar 2007
    Posts
    150
    Location
    Hempstead, TX
    Tractor
    Case DX55

    Default Re: Engine carbon cleaning

    I pulled the head. Seafoam does work pretty good. I used a can on this engine. However, it will NOT get 20+ years of carbon off the piston. I cleaned it with a wire brush, now i just have to put the head and gasket back on. I dont have a torque wrench or manual for it. Ive never needed one for small engines. I always torque everything between 'not tight enough' and 'too tight'.

    I asked because i wasnt sure if it was necessary. Then last night, i decided to take the hood off, and then take the spark plug out to look.....then i took a cover off....then i figured what the ****, ill pull a bolt and see if its easy to take out....before i knew it, i had the head off and was committed.

    Works for me.

  10. #10
    Silver Member
    Join Date
    Feb 2006
    Posts
    178
    Location
    Southern MD
    Tractor
    Kubota B3030

    Default Re: Engine carbon cleaning

    Quote Originally Posted by art
    Years ago while working in a car dealership one of the shops lead mechanics told me that to make it easy for clean-up while rebuilding to get the engine warmed up and to hold it up about half throttle or at least enough for it not to stall and to take a spray bottle of water and spray it in the carb, I think it works great! Every engine I rebuild that I know needs it and not looking for an individual flaw it will take the carbon off and leave the parts nice and steam cleaner clean!
    Back in the 70's when I was working as a mechanic there were a lot of problems with cars carboning up and fouling plugs. We used to use the water trick to fix them. Kind of like steam cleaning the interior of the engine.

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